_______________ they got the machine tool rep...

_______________ they got the machine tool repaired.

A. At no time　　 B. In no time

C. At one time　　 D. In one time

高三英语单项填空简单题查看答案及解析

Scientists say they have used the gene-editing tool CRISPR to repair a person’s eyesight for the first time. The CRISPR tool makes it possible to change DNA to add needed genes or take some away if they lead to problems.

A patient recently had the procedure done for an inherited form of blindness. The operation took place at Oregon Health and Science University in Portland. “We literally have the potential to treat people who are essentially blind and make them see,” said Charles Albright. He is chief scientific officer at Editas Medicine in Cambridge, Massachusetts. Editas is one of the companies developing the treatment. Albright added, “We think it could open up a whole new set of medicines to go in and change your DNA.”

The people taking part in the study have a genetic condition that keeps the body from making a protein needed to turn light into signals to the brain, which leads to sight.

Scientists have found it difficult to treat the condition with usual gene therapy. So, they are aiming to edit or remove the mutation（突变）by making two cuts on either side of it. The hope is that the ends of DNA will reconnect and make the gene work as it should. Through a tube the width of a human hair, doctors put three drops of fluid containing the gene editing machinery just under the retina（视网膜）, which is the lining at the back of the eye that contains the light-sensing cells. Doctors believe they need to fix one-tenth to one-third of the cells to repair vision. In animal tests, scientists were able to correct half of the cells with the treatment, Albright said.

Some independent experts were hopeful about the new study. Dr. Kiran Musunuru is a gene-editing expert at the University of Pennsylvania. He said the treatment seems likely to work, based on tests in mice and monkeys. The gene editing tool stays in the eye and does not travel to other parts of the body. So, “If something goes wrong, the chance of harm is very small.” Musunuru said. “It makes for a good first step for doing gene editing in the body.”

1.Who can most possibly benefit from this new treatment?

A.Patients who are essentially color-blinded.

B.Patients who turn blind due to accidents or diseases.

C.Patients who are born with no ability to see.

D.Patients who lose their vision at a young age.

2.Which is Paragraph 4 mainly about?

A.The result of the treatment.

B.The theory of the treatment.

C.The difficulty of the treatment.

D.The disadvantage of traditional treatment.

3.What is likely to be discussed after the last paragraph?

A.The function of the gene-editing tool.

B.The limitation of the gene-editing tool.

C.The effect of the treatment on animals.

D.The research of the treatment on humans.

高三英语阅读理解中等难度题查看答案及解析

Everyone agreed to the suggestion that the machine________at once.

A．should be repaired                       B．be repaired

C．must be repaired                          D．be repaired

高三英语单项填空中等难度题查看答案及解析

The machine _____ . It hasn’t worked for years and no one wants to repair it.

A．didn’t work                          B．wasn’t working

C．doesn’t work                         D．isn’t working

高三英语单项填空中等难度题查看答案及解析

If it _____ earlier, the printing machine would not have broken down．

A．has been repaired　　　　　　 B．is repaired

C．had been repaired　　　　　　 D．was repaired

高三英语单项填空简单题查看答案及解析

When students got their textbooks at the beginning of the year at San Mateo High School, they also received the Yondr pouch Youdr (口袋), a locking device for their phones. The phone slides into it and gets locked through a magnetic (磁力的) device. It’s not unlocked again until the final bell rings. The procedure will repeat every day for the rest of the school year.

Adam Gelb, the vice-president, ran a pilot project last year with 20 students and decided to do a school-wide, bell to bell program for this school year. The Yondr pouch is a start-up in San Francisco with a mission to create phone-free spaces, something that is the very thought with Gelb.

“I really think it’s about being present and engaging in the adult that’s trying to teach you, and your peers that might be in your small group. That’s part of the main philosophy that we're trying to spread,” he said.

Brad Friedman, another teacher at the school, said he was becoming concerned with overuse of phones at school. He said he often saw students completely lost on their phones, some not socializing at all with other students.

This week, he’s already seeing the difference. “Everyone else was socializing and eating lunch together. That’s what I wasn’t seeing enough of when phone usage is at its worst,” he said.

A senior at San Mateo High School Djelani Phillips-Diop said he definitely panicked at first when he heard he had to lock his phone. “I panicked, I guess. Last year when we had phones, I was using it every day,” he said.

In case of emergency, every classroom has the unlocking device. Teachers still have access to their own cellphones and desk phones. “We’ve gotten all 1,700 students unlocked with a matter of minutes,” said Gelb.

We spoke to four students who, despite their initial panic, agreed that a phone-free school experience has its benefits.

1.What can we learn about the Yondr pouch from paragraph 1?

A.It is a device to lock phones. B.It is a bell to unlock phones.

C.It is a device to be used for a year. D.It is a phone intended for students.

2.The Youdr pouch is used more in Gelb’s school to ______________________.

A.create space to use phones freely

B.help the students to be more outgoing

C.encourage more mutual communication among students

D.help the students to realize the harm of overuse of phones

3.What is Friedman’s attitude to the use of the Yondr pouch ?

A.Concerned. B.Favorable.

C.Disapproving. D.Doubtful.

4.What can be learned from the passage?

A.The students were willing to have their phones locked at first.

B.The phone will get unlocked automatically when there is an emergency

C.Students prefer eating lunch together with their phones in hand.

D.Some students came to realize the benefits of the phone-free program.

高三英语阅读理解困难题查看答案及解析

Only when _____ possible to settle the problem how to get the machine repaired.

A. does the monitor come will it be        B. the monitor comes will it be

C. has the monitor come it will be         D. the monitor comes it will be

高三英语单项填空困难题查看答案及解析

What will the man probably do?

A.Have the fax machine repaired.

B.Call Mr. Steven in Washington.

C.Get the paper faxed next door.

高三英语短对话中等难度题查看答案及解析

听下面一段较长对话，回答以下小题。

1.Why does the school make the change?

A.To have the food machines repaired.

B.To encourage students to have a healthy diet.

C.To encourage students to protect the environment.

2.What is the man concerned about at first?

A.Where he will get food from.

B.How he can eat healthily.

C.What he can eat.

3.What does the woman think the man should do?

A.Lose weight. B.Drink more water. C.Eat in the lunch room.

4.What does the man think of bringing food to school?

A.Doubtful. B.Disappointing. C.Good.

高三英语长对话中等难度题查看答案及解析

Why did the man apologize to the woman?

A. He damaged her CD.

B. He couldn’t repair her machine.

C. He sold her a product of poor quality.

高三英语短对话中等难度题查看答案及解析